Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Tube SPDIF output
Tube SPDIF output
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 31st December 2017, 02:11 PM   #31
Lowrideris is offline Lowrideris
diyAudio Member
 
Join Date: May 2015
Quote:
Originally Posted by DF96 View Post
Rise time which is too fast can increase cable-related jitter.
do not agree, please study spdif protocol more closely, the faster signal rise, the less jitter is generated.plus dac is no more "quesing " it was 0 or 1,so data decoder is disbaling "data correction" algorithm
And ofcourse bad cable is bad in all situations, lets asume its good cable is used
  Reply With Quote
Old 1st January 2018, 11:22 AM   #32
12E1 is offline 12E1  United Kingdom
diyAudio Member
 
12E1's Avatar
 
Join Date: May 2012
Location: Near Huntingdon, Cambridgeshire, UK
Quote:
Originally Posted by Lowrideris View Post
do not agree, please study spdif protocol more closely, the faster signal rise, the less jitter is generated.plus dac is no more "quesing " it was 0 or 1,so data decoder is disbaling "data correction" algorithm
And ofcourse bad cable is bad in all situations, lets asume its good cable is used
This assumes that the faster risetime is preserved throught the signal chain.

Unless the cable is correctly matched and terminated with a correct load impedance (or source impedance if serially terminated), if the driver risetime is too fast, then ringing will occur at the receiver end, and maybe at the driver. That ringing at the receiver could cause further timing errors which defeat the original objective of trying to ensure accurate timing.

The problem is that many people think of S/PDIF as a solely digital signal. In the final analysis, digital signals still obey the laws of physiscs, and they dictate that signals with fast risetimes need correct handling to preserve timing details and to avoid overshoot / ringing if they are significant to the application.
  Reply With Quote
Old 1st January 2018, 03:06 PM   #33
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by Lowrideris
do not agree, please study spdif protocol more closely, the faster signal rise, the less jitter is generated.plus dac is no more "quesing " it was 0 or 1,so data decoder is disbaling "data correction" algorithm
No data correction takes place after SPDIF, so nothing to 'disable'. All you get is parity, so you either use or discard the data. An SPDIF implementation would have to be very bad to corrupt the data so badly that it fails the parity check.

Too fast slew rate can give rise to greater cable-related jitter, as I said. The details depend on things like cable length and how resistive the termination is at all frequencies. Basically, if you put a faster slew rate in then you must hope that the terminations remain correct up to higher frequencies. Obviously too low a slew rate causes trouble for the receiver data slicer.
  Reply With Quote
Old 2nd January 2018, 07:34 PM   #34
316a is offline 316a  England
diyAudio Member
 
316a's Avatar
 
Join Date: Dec 2002
Location: West London
What next ? A tubed I2S buffer ?

316a
  Reply With Quote

Reply


Tube SPDIF outputHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
SPDIF OUTPUT kawo Digital Source 96 17th June 2011 05:49 AM
SPDIF Output Korr Digital Line Level 8 25th February 2011 10:02 AM
CS8416 SPDIF Output AMR Digital Source 0 7th January 2011 06:15 PM
SPDIF output PCB kawo Digital Source 19 13th November 2010 02:29 PM
HELP! Quartet spdif output ichiban Digital Line Level 2 21st August 2009 07:45 AM


New To Site? Need Help?

All times are GMT. The time now is 12:57 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki